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What is BASIX?

Introduced by the NSW Government,the Building Sustainability Index, BASIX, ensures that homes are to be designed to use less potable water aa well as fewer greenhouse gas emissions by setting energy and water reduction targets for any type of dwelling.

BASIX is a NSW Government web-based tool that assesses the water, thermal comfort in some cases and energy efficiency of new and/or altered residential buildings. 


Do I need a BASIX certificate?

You will need a BASIX certificate if you are lodging a development application in NSW for a new home or for any alteration and addition, of $50,000 or more to an existing home.


How do I get a BASIX certificate?

A BASIX certificate is obtained after a professional completes the sustainability assessment for your project using the online BASIX assessment tool. Once the design parameters of your project have met the BASIX requirements, a certificate will be issued.


How does the assessment work?

The BASIX assessment will measure your proposed development for sustainability against the applicable BASIX targets that are based on the NSW home benchmark average. Then a score will be issued and adjustments are possible to be made on various fixtures etc.


What information is required for a BASIX assessment?

For a BASIX Assessment/Certificate to be prepared, we require the following information:

  • Site Plan

  • Set of drawings for the construction to be submitted to council.

  • Construction details

  • Usually all the necessary information is provided in the drawings. If further is needed, our staff will contact you.

Information should be emailed through on


How long does an assessment take to be prepared?

Depending on the size of the project turn-around times vary. However for single dwelling projects, one business day is normally the go. For more complex projects, please contact for indicative time frames. At all times, we will ensure  that your job will be done as fast as possible.


What does it cost?

For an obligation free fee proposal, go to the contact page and send an inquiry.


What is NatHERS?

The Nationwide House Energy Rating Scheme (NatHERS) is a national framework for the purpose of regulating how Australian homes are rated for their thermal performance.

The costs and environmental impacts of heating and cooling a home can be reduced through good design and construction of our homes. Assessment of a building's thermal performance at design stage by a NatHERS accredited assessor can identify simple, economical ways to make it more comfortable and save energy.


A NatHERS star rating depends on how much cooling or heating a 'standard family' (the occupants) may need to stay comfortable during a typical year. NatHERS accredited computer software simulates how heat enters and escapes a house every hour of every day of the year, assuming the occupants open and close windows and any blinds or awnings to make best use of the local climate.


Why use AENEC?

  • Quality Guaranteed

  • Very Fast Turn Around Times

  • Long Industry Experience

  • Excellent Service


More questions?

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